X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fwgtpkg-unit.c;h=e01faa9116f3fe505da716b856a2922c1e453bde;hb=6008a3ec4d1c0ed5df338b7c5f0775585ab51cfb;hp=8569c5a4ac010e929874ede7403547f494d1bd14;hpb=1d4de11a907e41c06063a2cd5028dc4101690f50;p=src%2Fapp-framework-main.git

diff --git a/src/wgtpkg-unit.c b/src/wgtpkg-unit.c
index 8569c5a..e01faa9 100644
--- a/src/wgtpkg-unit.c
+++ b/src/wgtpkg-unit.c
@@ -1,5 +1,5 @@
 /*
- Copyright 2016, 2017 IoT.bzh
+ Copyright (C) 2016-2019 IoT.bzh
 
  author: José Bollo <jose.bollo@iot.bzh>
 
@@ -25,15 +25,77 @@
 #include <unistd.h>
 #include <string.h>
 #include <errno.h>
+#include <limits.h>
+
+#include <json-c/json.h>
 
 #include "verbose.h"
 #include "utils-file.h"
 
 #include "wgtpkg-mustach.h"
+#include "utils-json.h"
+#include "wgt-json.h"
+#include "utils-systemd.h"
+
 #include "wgtpkg-unit.h"
+#include "wgt-strings.h"
 
+#if 0
+#include <ctype.h>
+#else
+#define isblank(c) ((c)==' '||(c)=='\t')
+#endif
+
+/* the template for all units */
 static char *template;
 
+/*
+ * Search for the 'pattern' in 'text'.
+ * Returns 1 if 'text' matches the 'pattern' or else returns 0.
+ * When returning 1 and 'after' isn't NULL, the pointer to the
+ * first character after the pettern in 'text' is stored in 'after'.
+ * The characters '\n' and ' ' have a special meaning in the search:
+ *  * '\n': matches any space or tabs (including none) followed
+ *          either by '\n' or '\0' (end of the string)
+ *  * ' ': matches any space or tabs but at least one.
+ */
+static int matches(const char *pattern, char *text, char **after)
+{
+	char p, t;
+
+	t = *text;
+	p = *pattern;
+	while(p) {
+		switch(p) {
+		case '\n':
+			while (isblank(t))
+				t = *++text;
+			if (t) {
+				if (t != p)
+					return 0;
+				t = *++text;
+			}
+			break;
+		case ' ':
+			if (!isblank(t))
+				return 0;
+			do {
+				t = *++text;
+			} while(isblank(t));
+			break;
+		default:
+			if (t != p)
+				return 0;
+			t = *++text;
+			break;
+		}
+		p = *++pattern;
+	}
+	if (after)
+		*after = text;
+	return 1;
+}
+
 /*
  * Pack a null terminated 'text' by removing empty lines,
  * lines made of blanks and terminated with \, lines
@@ -42,20 +104,31 @@ static char *template;
  * "nl" exactly (without quotes ") are replaced with
  * an empty line.
  *
- * Returns the pointer to the ending null.
+ * Returns the size after packing (offset of the ending null).
  */
-static char *pack(char *text, char purge)
+static size_t pack(char *text, char purge)
 {
-	char *read, *write, *begin, *start, c, emit, cont, nextcont;
-
-	cont = 0;
-	c = *(begin = write = read = text);
+	char *read;    /* read iterator */
+	char *write;   /* write iterator */
+	char *begin;   /* begin the copied text of the line */
+	char *start;   /* first character of the line that isn't blanck */
+	char c;        /* currently scanned character (pointed by read) */
+	char emit;     /* flag telling whether line is to be copied */
+	char cont;     /* flag telling whether the line continues the previous one */
+	char nextcont; /* flag telling whether the line will continues the next one */
+
+	nextcont = 0;
+	c = *(write = read = text);
+
+	/* iteration over lines */
 	while (c) {
+		/* computes emit, nextcont, emit and start for the current line */
+		cont = nextcont;
 		emit = nextcont = 0;
 		start = NULL;
 		begin = read;
 		while (c && c != '\n') {
-			if (c != ' ' && c != '\t') {
+			if (!isblank(c)) {
 				if (c == '\\' && read[1] == '\n')
 					nextcont = 1;
 				else {
@@ -68,21 +141,25 @@ static char *pack(char *text, char purge)
 		}
 		if (c)
 			c = *++read;
-		if (emit) {
+		/* emit the line if not empty */
+		if (emit || (cont && !nextcont)) {
+			/* removes the blanks on the left of not continuing lines */
 			if (!cont && start)
 				begin = start;
+			/* check if purge applies */
 			if (purge && *begin == purge) {
+				/* yes, insert new line if requested */
 				if (!strncmp(begin+1, "nl\n",3))
 					*write++ = '\n';
 			} else {
+				/* copies the line */
 				while (begin != read)
 					*write++ = *begin++;
 			}
 		}
-		cont = nextcont;
 	}
 	*write = 0;
-	return write;
+	return (size_t)(write - text);
 }
 
 /*
@@ -104,123 +181,190 @@ static inline char *nextline(char *text)
  */
 static char *offset(char *text, const char *pattern, char **args)
 {
-	size_t len;
-
-	if (text) {
-		len = strlen(pattern);
-		do {
-			if (strncmp(text, pattern, len))
-				text = nextline(text);
-			else {
-				if (args)
-					*args = &text[len];
-				break;
-			}
-		} while (text);
-	}
+	while (text && !matches(pattern, text, args))
+		text = nextline(text);
 	return text;
 }
 
 /*
  * process one unit
  */
-
 static int process_one_unit(char *spec, struct unitdesc *desc)
 {
-	char *nsoc, *nsrv;
-	int isuser, issystem, issock, isserv;
+	char *nsoc, *nsrv, *name, *wanted;
+	int isuser, issystem, issock, isserv, iswanted;
+	size_t len;
 
-	/* found the configuration directive of the unit */
+	/* finds the configuration directive of the unit */
 	isuser = !!offset(spec, "%systemd-unit user\n", NULL);
 	issystem = !!offset(spec, "%systemd-unit system\n", NULL);
 	issock  = !!offset(spec, "%systemd-unit socket ", &nsoc);
 	isserv  = !!offset(spec, "%systemd-unit service ", &nsrv);
+	iswanted = !!offset(spec, "%systemd-unit wanted-by ", &wanted);
 
-	if (isuser ^ issystem) {
+	/* check the unit scope */
+	if ((isuser + issystem) == 1) {
 		desc->scope = isuser ? unitscope_user : unitscope_system;
 	} else {
 		desc->scope = unitscope_unknown;
 	}
 
-	if (issock ^ isserv) {
+	/* check the unit type */
+	if ((issock + isserv) == 1) {
 		if (issock) {
 			desc->type = unittype_socket;
-			desc->name = nsoc;
+			name = nsoc;
 		} else {
 			desc->type = unittype_service;
-			desc->name = nsrv;
+			name = nsrv;
 		}
-		desc->name_length = (size_t)(strchrnul(desc->name, '\n') - desc->name);
-		desc->name = strndup(desc->name, desc->name_length);
+		len = strcspn(name, " \t\n");
+		desc->name = strndup(name, len);
+		desc->name_length = desc->name ? len : 0;
 	} else {
 		desc->type = unittype_unknown;
 		desc->name = NULL;
 		desc->name_length = 0;
 	}
 
+	if (iswanted) {
+		len = strcspn(wanted, " \t\n");
+		desc->wanted_by = strndup(wanted, len);
+		desc->wanted_by_length = len;
+	} else {
+		desc->wanted_by = NULL;
+		desc->wanted_by_length = 0;
+	}
+
 	desc->content = spec;
-	desc->content_length = (size_t)(pack(spec, '%') - spec);
+	desc->content_length = pack(spec, '%');
 
 	return 0;
 }
 
 /*
+ * Processes all the units of the 'corpus'.
+ * Each unit of the corpus is separated and packed and its
+ * charactistics are stored in a descriptor.
+ * At the end if no error was found, calls the function 'process'
+ * with its given 'closure' and the array descripbing the units.
+ * Return 0 in case of success or a negative value in case of error.
  */
-static int process_all_units(char *spec, int (*process)(void *closure, const struct unitdesc descs[], unsigned count), void *closure)
+static int process_all_units(char *corpus, const struct unitconf *conf, int (*process)(void *closure, const struct generatedesc *desc), void *closure, struct json_object *jdesc)
 {
 	int rc, rc2;
-	unsigned n;
-	char *beg, *end, *after;
-	struct unitdesc *descs, *d;
-
-	descs = NULL;
-	n = 0;
-	rc = 0;
-	beg = offset(spec, "%begin systemd-unit\n", NULL);
-	while(beg) {
-		beg = nextline(beg);
-		end = offset(beg, "%end systemd-unit\n", &after);
+	char *beg, *end, *befbeg, *aftend;
+	struct unitdesc *u;
+	struct generatedesc gdesc;
+
+	gdesc.conf = conf;
+	gdesc.desc = jdesc;
+	gdesc.units = NULL;
+	gdesc.nunits = 0;
+	rc = rc2 = 0;
+
+	/* while there is a unit in the corpus */
+	for(;;) {
+		befbeg = offset(corpus, "%begin ", &beg);
+		end = offset(corpus, "%end ", &aftend);
+		if (!befbeg) {
+			if (end) {
+				/* %end detected without %begin */
+				ERROR("unexpected %%end at end");
+				rc = rc ? :-EINVAL;
+			}
+			break;
+		}
 		if (!end) {
 			/* unterminated unit !! */
-			ERROR("unterminated unit description!! %s", beg);
-			break;
+			ERROR("unterminated unit description!!");
+			corpus = beg;
+			rc2 = -EINVAL;
+		} else if (end < befbeg) {
+			/* sequence %end ... %begin detected !! */
+			ERROR("unexpected %%end before %%begin");
+			corpus = aftend;
+			rc2 = -EINVAL;
+		} else {
+			befbeg =  offset(beg, "%begin ", NULL);
+			if (befbeg && befbeg < end) {
+				/* sequence %begin ... %begin ... %end detected !! */
+				ERROR("unexpected %%begin after %%begin");
+				corpus = beg;
+				rc2 = -EINVAL;
+			} else {
+				*end = 0;
+				corpus = aftend;
+				if (matches("systemd-unit\n", beg, &beg)) {
+					if (!matches("systemd-unit\n", aftend, &corpus)) {
+						/* end doesnt match */
+						ERROR("unmatched %%begin systemd-unit (matching end mismatch)");
+						rc2 = -EINVAL;
+					} else {
+						/* allocates a descriptor for the unit */
+						u = realloc((void*)gdesc.units, ((unsigned)gdesc.nunits + 1) * sizeof *gdesc.units);
+						if (u == NULL)
+							rc2 = -ENOMEM;
+						else {
+							/* creates the unit description */
+							gdesc.units = u;
+							u = &u[gdesc.nunits];
+							memset(u, 0, sizeof *u);
+							rc2 = process_one_unit(beg, u);
+							if (rc2 >= 0)
+								gdesc.nunits++;
+						}
+					}
+				} else {
+					ERROR("unexpected %%begin name");
+					rc2 = -EINVAL;
+				}
+			}
 		}
-		*end = 0;
-
-		d = realloc(descs, (n + 1) * sizeof *descs);
-		if (d == NULL)
-			rc2 = -ENOMEM;
-		else {
-			memset(&d[n], 0, sizeof *d);
-			descs = d;
-			rc2 = process_one_unit(beg, &descs[n]);
+		/* records the error if there is an error */
+		if (rc2 < 0) {
+			rc = rc ? : rc2;
+			rc2 = 0;
 		}
-
-		if (rc2 >= 0)
-			n++;
-		else if (rc == 0)
-			rc = rc2;
-		beg = offset(after, "%begin systemd-unit\n", NULL);
 	}
 
+	/* call the function that processes the units */
 	if (rc == 0 && process)
-		rc = process(closure, descs, n);
-	while(n)
-		free((char *)(descs[--n].name));
-	free(descs);
+		rc = process(closure, &gdesc);
+
+	/* cleanup and frees */
+	while(gdesc.nunits) {
+		free((void*)(gdesc.units[--gdesc.nunits].name));
+		free((void*)(gdesc.units[gdesc.nunits].wanted_by));
+	}
+	free((void*)gdesc.units);
 
 	return rc;
 }
 
-int unit_generator_on(const char *filename)
+/*
+ * Clear the unit generator
+ */
+void unit_generator_close_template()
+{
+	free(template);
+	template = NULL;
+}
+
+/*
+ * Initialises the unit generator with the content of the file of path 'filename'.
+ * Returns 0 in case of success or a negative number in case of error.
+ */
+int unit_generator_open_template(const char *filename)
 {
 	size_t size;
 	char *tmp;
 	int rc;
 
+	unit_generator_close_template();
 	rc = getfile(filename ? : FWK_UNIT_CONF, &template, NULL);
 	if (!rc) {
-		size = (size_t)(pack(template, ';') - template);
+		size = pack(template, ';');
 		tmp = realloc(template, 1 + size);
 		if (tmp)
 			template = tmp;
@@ -228,27 +372,223 @@ int unit_generator_on(const char *filename)
 	return rc;
 }
 
-void unit_generator_off()
+static int add_metadata(struct json_object *jdesc, const struct unitconf *conf)
 {
-	free(template);
-	template = NULL;
+	struct json_object *targets, *targ;
+	char portstr[30], afidstr[30];
+	int port, afid, i, n;
+
+	if (json_object_object_get_ex(jdesc, string_targets, &targets)) {
+		n = json_object_array_length(targets);
+		for (i = 0 ; i < n ; i++) {
+			targ = json_object_array_get_idx(targets, i);
+			if (!conf->new_afid) {
+				afid = 0;
+				port = 0;
+			} else {
+				afid = conf->new_afid();
+				if (afid < 0)
+					return afid;
+				port = conf->base_http_ports + afid;
+			}
+			sprintf(afidstr, "%d", afid);
+			sprintf(portstr, "%d", port);
+			if (!j_add_many_strings_m(targ,
+				"#metatarget.http-port", portstr,
+				"#metatarget.afid", afidstr,
+				NULL))
+				return -1;
+		}
+	}
+
+	return 	j_add_many_strings_m(jdesc,
+		"#metadata.install-dir", conf->installdir,
+		"#metadata.icons-dir", conf->icondir,
+		NULL) ? 0 : -1;
 }
 
-int unit_generator_process(struct json_object *jdesc, int (*process)(void *closure, const struct unitdesc descs[], unsigned count), void *closure)
+/*
+ * Applies the object 'jdesc' augmented of meta data coming
+ * from 'conf' to the current unit generator.
+ * The current unit generator will be set to the default one if not unit
+ * was previously set using the function 'unit_generator_open_template'.
+ * The callback function 'process' is then called with the
+ * unit descriptors array and the expected closure.
+ * Return what returned process in case of success or a negative
+ * error code.
+ */
+int unit_generator_process(struct json_object *jdesc, const struct unitconf *conf, int (*process)(void *closure, const struct generatedesc *desc), void *closure)
 {
 	int rc;
 	size_t size;
 	char *instance;
 
-	rc = template ? 0 : unit_generator_on(NULL);
-	if (!rc) {
-		instance = NULL;
-		rc = apply_mustach(template, jdesc, &instance, &size);
+	rc = add_metadata(jdesc, conf);
+	if (rc)
+		ERROR("can't set the metadata. %m");
+	else {
+		rc = template ? 0 : unit_generator_open_template(NULL);
 		if (!rc) {
-			rc = process_all_units(instance, process, closure);
+			instance = NULL;
+			rc = apply_mustach(template, jdesc, &instance, &size);
+			if (!rc)
+				rc = process_all_units(instance, conf, process, closure, jdesc);
+			free(instance);
 		}
-		free(instance);
 	}
 	return rc;
 }
 
+/**************** SPECIALIZED PART *****************************/
+
+static int check_unit_desc(const struct unitdesc *desc, int tells)
+{
+	if (desc->scope != unitscope_unknown && desc->type != unittype_unknown && desc->name != NULL)
+		return 0;
+
+	if (tells) {
+		if (desc->scope == unitscope_unknown)
+			ERROR("unit of unknown scope");
+		if (desc->type == unittype_unknown)
+			ERROR("unit of unknown type");
+		if (desc->name == NULL)
+			ERROR("unit of unknown name");
+	}
+	errno = EINVAL;
+	return -1;
+}
+
+static int get_unit_path(char *path, size_t pathlen, const struct unitdesc *desc)
+{
+	int rc = systemd_get_unit_path(
+			path, pathlen, desc->scope == unitscope_user,
+			desc->name, desc->type == unittype_socket ? "socket" : "service");
+
+	if (rc < 0)
+		ERROR("can't get the unit path for %s", desc->name);
+
+	return rc;
+}
+
+static int get_wants_path(char *path, size_t pathlen, const struct unitdesc *desc)
+{
+	int rc = systemd_get_wants_path(
+			path, pathlen, desc->scope == unitscope_user, desc->wanted_by,
+			desc->name, desc->type == unittype_socket ? "socket" : "service");
+
+	if (rc < 0)
+		ERROR("can't get the wants path for %s and %s", desc->name, desc->wanted_by);
+
+	return rc;
+}
+
+static int get_wants_target(char *path, size_t pathlen, const struct unitdesc *desc)
+{
+	int rc = systemd_get_wants_target(
+			path, pathlen,
+			desc->name, desc->type == unittype_socket ? "socket" : "service");
+
+	if (rc < 0)
+		ERROR("can't get the wants target for %s", desc->name);
+
+	return rc;
+}
+
+static int do_uninstall_units(void *closure, const struct generatedesc *desc)
+{
+	int rc, rc2;
+	int i;
+	char path[PATH_MAX];
+	const struct unitdesc *u;
+
+	rc = 0;
+	for (i = 0 ; i < desc->nunits ; i++) {
+		u = &desc->units[i];
+		rc2 = check_unit_desc(u, 0);
+		if (rc2 == 0) {
+			rc2 = get_unit_path(path, sizeof path, u);
+			if (rc2 >= 0) {
+				rc2 = unlink(path);
+			}
+			if (rc2 < 0 && rc == 0)
+				rc = rc2;
+			if (u->wanted_by != NULL) {
+				rc2 = get_wants_path(path, sizeof path, u);
+				if (rc2 >= 0)
+					rc2 = unlink(path);
+			}
+		}
+		if (rc2 < 0 && rc == 0)
+			rc = rc2;
+	}
+	return rc;
+}
+
+static int do_install_units(void *closure, const struct generatedesc *desc)
+{
+	int rc;
+	int i;
+	char path[PATH_MAX + 1], target[PATH_MAX + 1];
+	const struct unitdesc *u;
+
+	i = 0;
+	while (i < desc->nunits) {
+		u = &desc->units[i];
+		rc = check_unit_desc(u, 1);
+		if (!rc) {
+			rc = get_unit_path(path, sizeof path, u);
+			if (rc >= 0) {
+				rc = putfile(path, u->content, u->content_length);
+				if (rc >= 0 && u->wanted_by != NULL) {
+					rc = get_wants_path(path, sizeof path, u);
+					if (rc >= 0) {
+						rc = get_wants_target(target, sizeof target, u);
+						if (rc >= 0) {
+							unlink(path); /* TODO? check? */
+							rc = symlink(target, path);
+						}
+					}
+				}
+				i++;
+			}
+		}
+		if (rc < 0)
+			goto error;
+	}
+	return 0;
+error:
+	i = errno;
+	do_uninstall_units(closure, desc);
+	errno = i;
+	return rc;
+}
+
+static int do_install_uninstall(
+		struct wgt_info *ifo,
+		const struct unitconf *conf,
+		int (*doer)(void *, const struct generatedesc *)
+)
+{
+	int rc;
+	struct json_object *jdesc;
+
+	jdesc = wgt_info_to_json(ifo);
+	if (!jdesc)
+		rc = -1;
+	else {
+		rc = unit_generator_process(jdesc, conf, doer, NULL);
+		json_object_put(jdesc);
+	}
+	return rc;
+}
+
+int unit_install(struct wgt_info *ifo, const struct unitconf *conf)
+{
+	return do_install_uninstall(ifo, conf, do_install_units);
+}
+
+int unit_uninstall(struct wgt_info *ifo, const struct unitconf *conf)
+{
+	return do_install_uninstall(ifo, conf, do_uninstall_units);
+}
+